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<p>Continuous rice cropping using organic and inorganic fertilizers might affect greenhouse gas emissions and their balance, rice yield, and soil aggregate stability, as investigated at the experimental farm of Bangladesh Rice Research Institute. The influence of vermicompost (VC) rates with chemical fertilizers on greenhouse gas (GHG) emission, GHG intensity, emission factor, and rice yields was evaluated in a Boro (January-May)-Fallow-T. Aman (July-November) cropping system.&#xa0;The static close chamber technique estimated methane (CH<sub>4</sub>), nitrous oxide (N<sub>2</sub>O), and carbon dioxide (CO<sub>2</sub>).&#xa0;Total CH<sub>4</sub>, N<sub>2</sub>O, CO<sub>2</sub> flux, net carbon emission (NCE), GHG intensity, and GHG emission factors (EFs) were significantly lower with 0.5 t ha<sup>− 1</sup> VC + recommended chemical fertilizers (RCF) dose and reduced about 28–29% CH<sub>4</sub>, 35–48% N<sub>2</sub>O, and 22–23% CO<sub>2</sub> emissions than other rates of VC incorporation. In the Boro rice season, the GHG intensity was 1.09–1.51&#xa0;kg CO<sub>2</sub> eq.&#xa0;kg<sup>− 1</sup> grain yield and 1.42–3.63&#xa0;kg CO<sub>2</sub> eq.&#xa0;kg<sup>− 1</sup> grain yield in the T. Aman season under different rates of VC incorporation. Variable rates of VC incorporation increased about 7–23% mean weight diameter, 6–20% of total soil carbon stock, 20–25% grain yield, and reduced 1–4% bulk density than the sole RCF. The net soil carbon budget was negative − 57&#xa0;kg ha<sup>− 1</sup> for sole RCF, and positive was 74–360&#xa0;kg ha<sup>− 1</sup> with variable rates of VC incorporation.&#xa0;It is concluded that 0.5 t ha<sup>− 1</sup> VC + RCF could be adopted for reducing 42–143% of GHG intensity, 33–112% of GHG emission factors, and grain yield and soil carbon sequestration improve for Boro-Fallow-T. Aman cropping system.</p>

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Greenhouse Gas Intensity and Emission Factor as Influenced by Vermicompost Incorporation Rates in Rice-Fallow-Rice Cropping System

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Md Mozammel Haque,
  • A. Islam,
  • M. R. Islam,
  • M. Akter,
  • A. Jahan,
  • J. C. Biswas

摘要

Continuous rice cropping using organic and inorganic fertilizers might affect greenhouse gas emissions and their balance, rice yield, and soil aggregate stability, as investigated at the experimental farm of Bangladesh Rice Research Institute. The influence of vermicompost (VC) rates with chemical fertilizers on greenhouse gas (GHG) emission, GHG intensity, emission factor, and rice yields was evaluated in a Boro (January-May)-Fallow-T. Aman (July-November) cropping system. The static close chamber technique estimated methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2). Total CH4, N2O, CO2 flux, net carbon emission (NCE), GHG intensity, and GHG emission factors (EFs) were significantly lower with 0.5 t ha− 1 VC + recommended chemical fertilizers (RCF) dose and reduced about 28–29% CH4, 35–48% N2O, and 22–23% CO2 emissions than other rates of VC incorporation. In the Boro rice season, the GHG intensity was 1.09–1.51 kg CO2 eq. kg− 1 grain yield and 1.42–3.63 kg CO2 eq. kg− 1 grain yield in the T. Aman season under different rates of VC incorporation. Variable rates of VC incorporation increased about 7–23% mean weight diameter, 6–20% of total soil carbon stock, 20–25% grain yield, and reduced 1–4% bulk density than the sole RCF. The net soil carbon budget was negative − 57 kg ha− 1 for sole RCF, and positive was 74–360 kg ha− 1 with variable rates of VC incorporation. It is concluded that 0.5 t ha− 1 VC + RCF could be adopted for reducing 42–143% of GHG intensity, 33–112% of GHG emission factors, and grain yield and soil carbon sequestration improve for Boro-Fallow-T. Aman cropping system.